Antlia LRGBR+ Dark series filters - 50mm unmounted

The Antlia LRGB Dark series filters 50mm are designed with a full  visible spectrum curve with specific wavelength ranges: L:400nm-710nm,R:595-705nm,G: 495-605nm, B:410-505nm for high signal-to-noise ratio and contrast imaging in deep sky full-spectrum photography.

The LRGB dark series filters are made of quartz glass, which has exceptional thermal and mechanical properties due to its ultra-low thermal expansion coefficient. These filters offer remarkable durability for imaging and research in the most challenging environmental conditions. Meanwhile, in astronomical imaging, the deformation of star points induced by environmental temperature variations can be effectively minimized.

The Antlia LRGB Dark series filters achieve an exceptionally high cut-off rate. This requires advanced equipment and increasing coating layers to block unwanted spectral bands, ensuring superior optical performance and enhancing product quality.

The LRGB Dark series filters are ideally paired with Antlia SHO 2.5nm Ultra Narrowband filters, as both utilize the same quartz substrate and refractive index, ensuring superior parfocality.

Filters Specifications:

The main features and application:

- Full visible spectrum design enhances the sensitivity of astronomical imaging;

- High transmittance B filter≥95%，L/R/G filter≥97%，this ensures that there is almost no loss in image signal, maximizing contrast;

- Made of quartz glass, excellent durability and thermal stability, as well as better fracture and scratch resistance, improved coating resilience to cleaning;

- Out of band blocking specification is designed to OD4.5 (0.005%) to block interference from other wavelengths and minimize halos around bright stars;

- Identical filter thickness to existing standards and double-sided fine polishing, with utmost care for parfocality;

- All Antlia filters are coated to the edge of the substrate and unmounted narrowband filters are edge blackened to eliminate internal reflections from stray light；

- Filters are resistant to scratches；

- Warranty: 3-years against delamination.

Filter Ring:

Antlia standard thread:1.25’’ (M28.5*0.6)，2’’(M48*0.75 pitch)

Ultra-thin filter cell to minimize vignetting by maximize possible clear aperture

Black Anodized Finish

Laser Engraving No Fading

Not Recommended:

Solar imaging

Night visual observation

Not Permitted:

DO NOT LOOK AT THE SUN WITH THIS FILTER

Serious eye damage will result if you fail to observe the warning.